[GHC] #9596: Create monoidal category framework for arrow desugarer

[GHC]

#9596: Create monoidal category framework for arrow desugarer
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              Reporter:              |            Owner:  spacekitteh
  spacekitteh                        |           Status:  new
                  Type:  task        |        Milestone:  7.10.1
              Priority:  normal      |          Version:
             Component:  GHC API     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Project (more
  Unknown/Multiple                   |  than a week)
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:  #7828
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by spacekitteh):

 Will do, Simon! I'm just throwing together a quick preliminary design to
 put up there.

 Ironically, I need injective type families to provide some of the nicer
 things such as automatic instances for when symmetric categories implement
 a left or right class; the compiler gets upset at the ID type family for
 the monoidal category.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9596#comment:7>
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